Toxicological Responses of Photosynthetic Genes in <i>Chlorella vulgaris</i> Exposed to Environmentally Relevant Concentrations of TiO<sub>2</sub> Nanoparticles.

In contrast, the highest concentration (17.6 μg/L) showed a highly significant difference from the control (mean difference = −61.00; * p < 0.001), marking the point at which the stimulatory effect on cell proliferation becomes evident in C. vulgaris cultures ( Table 1 ).

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